Cabletron Systems THN-MIM User manual

Brand: Cabletron Systems

Model: THN-MIM

Category: Bridges & repeaters

Type: User manual

Cabletron Systems THN-MIM features Ethernet and IEE 802.3 coaxial cable connectors, which can extend your network to up to 84 coaxial segments using an MMAC-8 enclosure. It can also be mixed with other Media Interface Modules for diverse media connections. The THN-MIM can automatically segment problem ports from the network and reconnect them once a valid data packet is received, ensuring fault isolation and maintaining network integrity. With LANVIEW LEDs for each port, you can conveniently diagnose physical layer issues as they arise.

COAXIAL MEDIA INTERFACE

MODULE (THN-MIM)

INSTALLATION GUIDE

The Complete Networking Solution™

CABLETRON SYSTEMS, P. O. Box 5005, Rochester, NH 03867-0505

NOTICE

Cabletron Systems reserves the right to make changes in specifications

and other information contained in this document without prior notice.

The reader should in all cases consult Cabletron Systems to determine

whether any such changes have been made.

The hardware, firmware, or software described in this manual is

subject to change without notice.

IN NO EVENT SHALL CABLETRON SYSTEMS BE LIABLE FOR

ANY INCIDENTAL, INDIRECT, SPECIAL, OR CONSEQUENTIAL

DAMAGES WHATSOEVER (INCLUDING BUT NOT LIMITED TO

LOST PROFITS) ARISING OUT OF OR RELATED TO THIS

MANUAL OR THE INFORMATION CONTAINED IN IT, EVEN IF

CABLETRON SYSTEMS HAS BEEN ADVISED OF, KNOWN, OR

SHOULD HAVE KNOWN, THE POSSIBILITY OF SUCH DAMAGES.

Cabletron Systems Inc.

P.O. Box 5005, Rochester, NH 03867-0505

Printed in the United States of America

Order Number: 9030034-02 February 92

MMAC

MMAC-8

THN-MIM

LAN-MD

TMS-3

, and,

Remote

LANVIEW

are trademarks of Cabletron Systems, Inc.

LANVIEW

and

SPECTRUM

are registered trademarks of Cabletron

Systems, Inc.

NOTICE

FCC NOTICE

This device complies with Part 15 of FCC rules. Operation is subject to

the following two conditions: (1) this device may not cause harmful

interference, and (2) this device must accept any interference received,

including interference that may cause undesired operation.

NOTE: This equipment has been tested and found to comply with the

limits for a Class A digital device, pursuant to Part 15 of FCC Rules.

These limits are designed to provide reasonable protection against

harmful interference when the equipment is operated in a commercial

environment. This equipment uses, generates, and can radiate radio

frequency energy and if not installed in accordance with the operator’s

manual, may cause harmful interference to radio communications.

Operation of this equipment in a residential area is likely to cause

interference in which case the user will be required at his own expense

to correct the interference.

If this equipment does cause interference to radio or television, which

can be determined by turning the equipment off and on, the user is

encouraged to try to correct the interference by one or more of the

following measures:

• Re-orient the receiving antenna.

• Relocate the equipment with respect to the receiving antenna.

• Move the equipment away from the receiver.

• Plug the equipment into a different outlet so that the equipment and

the receiver are on different branch circuits.

If necessary, the user should consult the dealer or an experienced

radio/ television technician for additional suggestions. The user may

find the following booklet prepared by the Federal Communication

Commission helpful:

“How to Identify and Resolve Radio TV Interference Problems”

This booklet is available from the U.S. Government Printing Office,

Washington D.C. 20402 - Stock No. 004-000-00345-4.

CONTENTS

iii

TABLE OF CONTENTS

CHAPTER 1 INTRODUCTION

1.1 INTRODUCTION ........................................................................1-1

1.2 USING THIS MANUAL..............................................................1-2

1.3 SPECIFICATIONS ......................................................................1-2

1.4 RELATED USER MANUALS.....................................................1-4

CHAPTER 2 INSTALLATION

2.1 INTRODUCTION ........................................................................2-1

2.2 NETWORK DESIGN GUIDELINES..........................................2-1

2.2.1 Thin-net Segments..............................................................2-1

2.2.2 Thin-net Segments (THN-MIM7593 only) ........................2-2

2.2.3 Thick-net Segments............................................................2-3

2.3 INSTALLATION..........................................................................2-4

CHAPTER 3 TESTING AND LANVIEW

3.1 INTRODUCTION ........................................................................3-1

3.2 INSTALLATION CHECK-OUT..................................................3-1

3.3 USING LANVIEW.......................................................................3-2

CONTENTS

INTRODUCTION

Page 1-1

CHAPTER 1

INTRODUCTION

1.1 INTRODUCTION

Cabletron Systems Coaxial Media Interface Module (THN-MIM)

provides 12 Ethernet/lEEE 802.3 coaxial cable connectors per module.

When used with the MMAC-8

™

enclosure, up to 84 coaxial segments

can be connected to one MMAC

™

The THN-MIM can be mixed with other Media Interface Modules to

provide a variety of different media connections. This means that you

can use a combination of twisted pair, fiber optic, and coaxial cabling

from one MMAC.

Each port on the THN-MIM is repeated by the Intelligent Repeater

Module (IRM). This feature assures data integrity and maximum data

path distance by regenerating and re-timing data packets each time

they enter the MMAC. This feature also assures fault isolation since

the MMAC will segment problem ports from the network

automatically. If a port is segmented, the port will be reconnected

automatically to the network once the port has received a valid data

packet.

Either thick or thin Ethernet cable can be connected to the THN-MIM.

Thin-net cable segments, using 50 ohm Ethernet type cable, can be

connected directly to the module. Each of these segments can be up to

185 meters in length and can support up to 29 users.

Thick-net cable segments made of 50 ohm Ethernet type cable can also

be connected to the modules. A BNC to N-Series adaptor must be used

to convert the thick-net cable to a thin-net cable. Each thick-net

segment can be up to 500 meters in length and can support up to 99

users.

If 12 thick-net segments are connected to a THN-MIM, up to 6000

meters of cable supporting 1024 host systems can be attached to that

one module.

Another model, the THN-MIM7593 is designed for use with 75 or 93

ohm coaxial cable. Thin-net cable segments, using 75 or 93 ohm cable,

INTRODUCTION

Page 1-2

can be connected directly to the module. Each of these segments

supports one device.

The entire THN-MIM or each port on the MIM can be controlled via the

IRM in your MMAC. The IRM can be accessed directly through a

console port on the front panel or be controlled and managed in-band

using Cabletron Systems Remote LANVIEW/Windows

™

SPECTRUM

, or SNMP compliant network control management

software.

Each port on the THN-MIM has two LANVIEW

LEDs, the Port OK

(POK) LED and the Receive (RCV) LED. The POK LED remains lit as

long as the port is connected to the network. If a port is segmented from

the network, the LED will not be lit. The RCV LED will be lit when

activity is detected on the segment. These LEDs help diagnose physical

layer problems as they arise.

1.2 USING THIS MANUAL

This manual provides instructions on installing the THN-MIM into

the MMAC, attaching coaxial segments to the MIM, and testing those

segments after they have been attached to the MIM.

This manual assumes that the user has a general working knowledge

of Ethernet, and of IEEE 802.3 type data communications networks

and their physical layer components.

If additional support is needed related to the Cabletron Systems

THN-MIM, or if you have any additional comments, improvements,

suggestions, or questions, feel free to contact Cabletron Systems

Technical Support at:

Cabletron Systems

P.O. Box 5005

Rochester, NH 03867-0505

Phone: (603) 332-9400

1.3 SPECIFICATIONS

Listed below are the specifications for the Cabletron Systems

THN-MIM.

INTRODUCTION

Page 1-3

NOTE:

Cabletron Systems reserves the right to change these

specifications at any time without notice.

BNC INTERFACE (Ports 1-12)

Type: BNC receptacle, with gold center contact,

for use with BNC type plugs and RG-58

thin-net cable.

Internal Transceiver: Cabletron Systems TMS-3 Transceiver.

For further information, refer to the

TMS-3 Transceiver User's Manual.

Terminations: Each segment is internally connected to a

50 ohm terminator in the port.

Grounding: Each segment connector shield is

internally connected to earth ground by the

THN-MIM. This eliminates the need for

grounding the segments connected to the

BNC ports.

INDICATORS

POK

Indicates that the port is connected to the

network.

When the module is first installed into the

MMAC, the LED will not be lit until the

first data packet passes through the port.

RCV

Indicates that the module is receiving a

data packet from that segment.

ENVIRONMENTAL REQUIREMENTS

Operating temperature: +5 to +40 C

Non-operating temperature: -30 to +80 C

Operating humidity: 5 to 95% (non-condensing)

INTRODUCTION

Page 1-4

SAFETY

WARNING:

It is the responsibility of the person who sells the system of

which the THN-MIM will be a part, to ensure that the total system meets

allowed limits of conducted and radiated emissions.

Designed in accordance with UL478, UL910, NEC 725-2(b), CSA, IEC,

TUV, VDE class A. Meets FCC part 15, Class A limits.

SERVICE

MTBF (MHBK-217D): >156,462 hr. predicted

MTTR: <0.5 hr.

PHYSICAL

Dimensions: 13.4 D x 11.5 H x 2 W inches

Weight: 2 lbs.

1.4 RELATED USER MANUALS

The manuals listed below should be used to supplement the procedures

and other technical data provided in this manual. The procedures

contained in these manuals will be referenced, rather than repeated in

this manual.

• Cabletron Systems

TMS-3 Transceiver

User's Manual

• Cabletron Systems

LAN-MD Portable Ethernet Tester

User's

Manual

INSTALLATION

Page 2-1

CHAPTER 2

INSTALLATION

2.1 INTRODUCTION

The Cabletron Systems THN-MIM is designed for quick and easy

installation into an MMAC. No special skills or tools are required to

install this module.

2.2 NETWORK DESIGN GUIDELINES

The following network design guidelines must be followed when

connecting segments to the THN-MIM. If not, unsatisfactory network

performance may result.

2.2.1 Thin-net Segments

This applies to the THN-MIM only. For the THN-MIM7593, see

section 2.2.2.

• 50 ohm RG-58A/U type coaxial cable must be used when making up

a thin-net cable segment. A 50 ohm terminator must be connected

to the far end of the thin-net segment.

• A maximum of 30 connections may be made to a thin-net cable

segment. These connections must be at least 0.5 meter apart.

• For safety, only one end of a thin-net segment should be connected

to earth ground. Connection to earth ground at more than one point

on the segment may allow for the occurrence of dangerous ground

currents. The BNC ports of the THN-MIM are connected to earth

ground. This eliminates the need of grounding the thin-net

segments connected to the module.

• Connections on a thin-net cable segment to host systems or

transceivers are made by BNC tee connectors. The male end of the

BNC tee connector is used to connect directly to the host or to the

transceiver. The female ends of the tee connector must be

connected to another part of the segment or to a terminator.

INSTALLATION

Page 2-2

Since the ports on the module are internally terminated, the end of

the segment that will be connected to the module will not be a tee

connector or terminator.

2.2.2 Thin-net Segments (THN-MIM7593 only)

The following network design guideline must be followed when

connecting 75 or 93 ohm coaxial cable segments to the THN-MIM7593.

If not, unsatisfactory network performance may result.

• The length of the 75 or 93 ohm coaxial cable segment is dependent

on signal loss from one end of the cable segment to the other. Signal

loss must not exceed 4 db when measured with a 5 MHz sine wave

or 6.5 db when measured with a 10 MHz sine wave.

• A 75 or 93 ohm coaxial cable segment will only support point to

point communication, from one Ethernet device to the

THN-MIM7593. No other Ethernet devices are allowed on the

segment.

• The far end of the 75 or 93 ohm coaxial cable segment must be

terminated with a 50 ohm terminator. This will ensure that the

Ethernet device on the segment will receive the proper collision

detection signal in the event of a collision.

• The Ethernet device should be connected as close as possible to the

terminator on the far end of the 75 or 93 ohm coaxial cable

segment. This will ensure that impedance mismatches due to

reflection can be predicted.

• The BNC ports of the THN-MIM7593 are connected to earth

ground. This eliminates the need for grounding the segment

connected to the module.

• Impedance mismatches may occur, resulting in signal degradation,

due to the 75 or 93 ohm coaxial cable segment being connected to a

50 ohm terminator. This may result in:

a. Increased jitter on the segment, ranging from +/-3 to +/-6 ns,

depending on the mismatch

b. Under certain conditions false collisions may be created.

INSTALLATION

Page 2-3

• The THN-MIM7593 does not report false collisions to the IRM.

However, if a non-Cabletron Systems Ethernet device is connected

to the segment, it is possible for false collisions to be generated.

Non-Cabletron System devices should be thoroughly tested before

using them with the THN-MIM7593.

2.2.3 Thick-net Segments

• 50 ohm Ethernet type coaxial cable must be used when making up

thick-net cable segments.

• Each thick-net cable segment connected to a THN-MIM module

must be no longer than 500 meters (1640 feet) in length.

When making up networks requiring shorter cable runs, Ethernet

standard length 23.4, 70.2, and 117 meter cable sections should be

used. These cable sections may be connected together by a barrel

connector to form a cable segment.

Use of non-standard cable lengths may result in impedance

mismatches causing reflections to occur. These reflections may

cause data errors.

• A 50 ohm terminator must be connected to the far end of the thick

segment.

• A BNC to N-Series adaptor must be connected to the applicable

BNC port to attach the thick-net segment to the module.

• A maximum of 100 transceivers may be attached to a thick-net

cable segment, and these transceivers must be at least 2.5 meters

apart throughout the length of the cable. Transceivers should be

placed on the black bands that run along the cable that are marked

at 2.5 meter intervals.

• For safety, only one end of a thick-net segment should be connected

to earth ground. Connection to earth ground at more than one point

on the segment may allow for the occurrence of dangerous ground

currents. The BNC ports of the THN-MIM are connected to earth

ground. This eliminates the need for grounding a thick-net

segment connected to the module.

INSTALLATION

Page 2-4

2.3 INSTALLATION

Install the THN-MIM into the MMAC as follows:

CAUTION:

Observe all electrostatic precautions when handling the

THN-MIM.

Static discharges will damage the module.

1. Remove the unit from the shipping box.

2. Slide the two foam end caps off the unit.

3. Remove the unit from the protective plastic bag and set the

THN-MIM in a static free area. Save the shipping box and

materials in case the module has to be reshipped.

4. Slide the module into the MMAC card cage.

5. Secure the module to the MMAC by turning the knurled knobs.

CAUTION:

Be sure the THN-MIM is firmly attached to the MMAC by

turning the knurled knobs.

Failure to do so may result in improper

operation.

Install the thick or thin-net cable segment(s) to the BNC ports(s)

on the module. If a thick-net cable segment is attached to a port on

the module, a BNC to N-Series adaptor must be attached to the

port.

The THN-MIM is now ready for operation. It is recommended that the

segments be tested prior to transmitting data. Refer to

Section 3.2 -

INSTALLATION CHECKOUT

TESTING AND LANVIEW

Page 3-1

CHAPTER 3

TESTING AND LANVIEW

3.1 INTRODUCTION

This section lists procedures to ensure that the segments connected to

the Cabletron Systems THN-MIM are operating properly. A

description of LANVIEW LEDs and their function in troubleshooting

physical layer network problems are also provided.

3.2 INSTALLATION CHECK-OUT

This section contains procedures to test that the physical layer of the

network and a coaxial segment connected to the THN-MIM are

operating properly. This section also contains procedures to check that

the physical layer of the network is operating properly. An Ethernet

node tester that will generate valid data packets, such as Cabletron

Systems LAN-MD, is required for this procedure.

NOTE:

This procedure should be performed only after testing each

segment to verify that the cable lengths, impedance and terminations

are within IEEE 802.3 specification limits.

For the purposes of this procedure, it is assumed that two Cabletron

Systems LAN-MDs are being used. For details on the LAN-MD, refer

to the LAN-MD User's Manual.

1. Using a transceiver and an AUI cable, connect a LAN-MD to the

segment connected to the applicable BNC port.

2. Select and run test

6 - SERVER

This LAN-MD now acts as a

SERVER

unit and will act as a packet

echoer when used with another LAN-MD.

3. Using a transceiver and an AUI cable, connect another LAN-MD to

any other tested segment connected to the MMAC.

4. Select and run test

4 - NODE

on the LAN-MD connected in step 3.

TESTING AND LANVIEW

Page 3-2

At least 100 packets should be sent and received with no errors.

The packets will be received from and sent back to the LAN-MD

acting as the

SERVER

When the applicable segment(s) connected to the THN-MIM have

successfully completed these tests, the segments are ready for normal

operation. If any failures were noted, please contact Cabletron Systems

Technical Support.

3.3 USING LANVIEW

The THN-MIM uses Cabletron Systems built-in visual diagnostic and

status monitoring system, LANVIEW. A network troubleshooter can

quickly scan the LANVIEW LEDs to observe network status, diagnose

network problems and identify which node or segment is faulty.

The following discusses the function and the purpose of each

LANVIEW LED on the THN-MIM.

NOTE:

There is one Port OK (

POK

) and Receive (

RCV

)

LED for each

port on the module.

Port OK (POK) LED

When lit, this LED indicates that the port is connected to the network.

If the LED is not lit, one of the following conditions exist:

a. The occurrence of 33 consecutive collisions on the attached

segment or the collision detector was on for more than 2.4 ms.,

causing the port to be electrically disconnected from the MMAC

b. The port was turned off by Local Management

c. The port has yet to receive a valid data packet after

segmentation or upon power up.

Receive (RCV) LED

This LED normally flashes on and off to indicate that the MMAC is

repeating the data packet. The rate at which the LED flashes will

increase as network activity increases.

Cabletron Systems THN-MIM User manual

Brand: Cabletron Systems

Model: THN-MIM

Category: Bridges & repeaters

Type: User manual

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